Abstract
The diocotron oscillation of the ℓ=1 mode, which was excited in a nonneutral electron plasma column, was damped by the continuous excitation of an axisymmetric electrostatic wave. The observed time evolution of the two-dimensional line-density profile showed that the density bump of the diocotron oscillation was flattened by the azimuthal diffusion enhanced by the axisymmetric wave field. The damping rate was nearly proportional to A s2/B (A s: wave field amplitude, B: magnetic field). This dependence can be explained using a simplified quasilinear model.
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